CN111340379A - Dissection method for deep sea water channel sand body building structure in thin well network area - Google Patents
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Abstract
The invention discloses an anatomy method of a deep sea water channel sand body building structure in a thin well network area, which comprises the following steps: based on core-logging-seismic data calibration analysis, carrying out identification on different-level cause sand body building structure interfaces of the deep sea water channel; taking the three-level sequence interface as constraint, fitting well drilling and seismic data according to the interface calibration result of the water channel system structure under the guidance of the water channel system deposition mode, and carrying out the sand body building structure analysis of the water channel system level; based on the analysis result of the water channel system, the sand body building structure analysis of the composite water channel series grade is realized; carrying out the sand body building structure analysis of the composite water channel level based on the composite water channel series constraint based on the analysis result of the composite water channel series; and carrying out the sand body building structure analysis of the single water channel based on the analysis result of the composite water channel. The invention can finely depict the shape, the flow path, the scale and the mutual overlapping relation of the underground deep sea water channel formation cause sand bodies of different scales and grades.
Description
Technical Field
The invention relates to the field of oil and gas field development geology, in particular to an anatomical method of a deep sea water channel sand body building structure in a thin well network area.
Background
Deep sea deposition is a hotspot and a leading edge field of oil and gas exploration and development in the world nowadays, wherein deep sea leaf deposition is known as a high-yield and high-recovery reservoir in deep sea deposition due to good reservoir performance and relatively weak heterogeneity, and also forms the focus of deep sea system research.
However, although such reservoirs have high porosity and permeability, under the influence of factors such as climate, sea level elevation, basin size and shape, sediment supply and the like, the internal structure (connectivity, geometric form, lithology and the like) of the reservoirs is complex and changeable, the body of the leaves is often rich in sand, the edges of the leaves are mutually layered with sand and mud, the surface of the leaves develop a water channel (supply water channel and external cut-in water channel), and the internal different-level configuration units (leaf system, composite leaves and single leaves) are mutually overlapped (Adedayo et al, 2005; Nick et al, 2012), so that the transverse and vertical communication degrees are different (Brown and att, 2002; Heat et al, Sl), thereby severely restricting the efficient development of the reservoirs.
In recent years, with the continuous improvement of geophysical technology and deep sea drilling technology, people have increasingly deepened understanding of deep water deposition, and deep water exploration obtains a series of breakthroughs in gulf of Mexico, West Africa, Brazil, the North China sea, the Nile river delta basin, the east Afu Wuma basin, the Bengal gulf, the south China sea and the like, so that the deep water deposition becomes one of the hot spots of current oil and gas exploration, and the deep water deposition oil and gas field is undoubtedly an important field of future energy exploration and development.
The deep-sea water channel is widely developed on land slopes, upland and deep-sea plains, is the most main sediment migration channel and coarse debris deposition place of a deep-water deposition system, and is also the main deep-water oil and gas reservoir of a land frame edge basin. However, due to the limitation of high operation cost of offshore drilling, production and operation and the like, the development well spacing of the deep-sea water channel oil reservoir is often large, the deep-sea water channel oil reservoir belongs to a typical thin well pattern area, and the existing sandstone fine dissection method for the dense well pattern area of most onshore oil and gas reservoirs is difficult to use for reference. Meanwhile, although the reservoirs of deep-sea water channel oil and gas reservoirs discovered throughout the world often have higher porosity and permeability, the sand body building structures of the deep-sea water channel oil and gas reservoirs are complex and changeable, and the thickness and the continuity of the reservoirs are greatly changed even in a short lateral distance, so that the water injection of a water injection well is ineffective, the effect of a production well is not obvious, and the residual oil distribution prediction difficulty is high, thereby seriously restricting the efficient development of the oil and gas reservoirs. At present, the related technology only stays at the dissection level of a large-scale sedimentation unit, the fine degree of the related technology can not meet the requirements of the middle and later periods of water channel oil reservoir development, and meanwhile, the prior art is lack of sediment body refinement, systematization cause mode and cross section interaction constraint, so that the dissection result has great uncertainty and the high-efficiency development requirement of the water channel oil reservoir can not be met, and therefore, a fine dissection method for the deep sea water channel sand body building structure of a thin well network area is urgently needed to be creatively invented.
Disclosure of Invention
In view of the above problems, the present invention aims to provide an anatomical method for deep sea water channel sand body building structure in thin well network region, which can finely depict the shape, flow path, scale and mutual overlapping relationship of the deep sea water channel cause sand bodies of different scale levels underground, so as to solve the above problems in the prior art.
The technical scheme of the invention is as follows:
an anatomy method of a deep sea water channel sand body building structure in a thin well network area comprises the following steps:
s1: based on core-logging-seismic data calibration analysis, the identification of the structural interface of the sand body building with different-level formation factors of the deep sea water channel is carried out.
Further, the deep sea water channel comprises the following four different levels from large to small: water channel system, composite water channel series, composite water channel and single water channel. The step S1 specifically includes the following sub-steps:
s11: identifying a structural interface of a single water channel level on a rock core according to the small scouring or lithofacies mutation characteristics of the single water channel bottom interface;
s12: calibrating a well by using a rock core, determining the interface characteristics of the single water channel level structure on a well logging curve, and identifying the well logging response characteristics of the composite water channel level structure interface through the single water channel combination, the medium-sized scouring surface and the rock phase change characteristics;
s13: and calibrating the earthquake by using a logging, determining the earthquake response characteristics of the interfaces of the single water channel and the composite water channel structure through the analysis of the well earthquake section morphology and pattern, and identifying the earthquake response characteristics of the interfaces of the composite water channel series and the water channel system level structure through the analysis of the composite water channel combination and the earthquake section structure.
S2: and fitting the drilling and seismic data according to the structural interface calibration result of the water channel system under the guidance of the sedimentation mode of the water channel system by taking the three-level sequence interface as constraint to carry out the hierarchical sand body building structure analysis of the water channel system.
Further, the step S2 specifically includes the following sub-steps:
s21: determining a three-level sequence stratum interface according to the seismic reflection structure and the homophase axis termination relation;
s22: taking the three-level sequence stratum interface as constraint, and under the guidance of limiting, semi-limiting and non-limiting water channel system section sedimentation modes, carrying out identification and tracking interpretation of the four-level sequence interface by synthesizing well seismic calibration results of the water channel system structure interface, carrying out water channel system section sand body building structure characterization in the framework, and determining the section form, thickness and section distribution pattern of the water channel system section sand body building structure;
s23: and (3) taking profile anatomy as constraint, extracting seismic attributes of the four-level sequence interface constraint under the guidance of a water channel system plane evolution mode, determining a water channel system plane boundary, determining a flow path, a width and a plane distribution pattern of the water channel system plane boundary, and finishing the water channel system plane sand body building structure representation.
S3: and based on the analysis result of the water channel system, under the guidance of the vertical superposition mode of the composite water channel series, integrating the interface calibration result of the composite water channel series structure, carrying out the identification and tracking of the earthquake small layer, and realizing the sand body building structure analysis of the composite water channel series grade.
Further, the step S3 specifically includes the following sub-steps:
s31: based on the water channel system dissection result, the isolated vertical type, stacked type and cut-and-stack type vertical stacking mode of the composite water channel is taken as guidance, on the basis of the composite water channel series well seismic calibration result, seismic small layer identification of three-level and four-level sequence interface constraints is carried out, the whole-area tracking interpretation is completed, the structural characterization of the composite water channel series section sand body building is carried out in the framework, and the thickness and the section stacking pattern are determined;
s32: based on the dissection of the composite water channel series section, the seismic attribute with obvious response to the composite water channel series is screened out by utilizing the seismic attribute optimization technology based on well-seismic combination, the plane boundary of the composite water channel series is determined, the flow path, the width and the plane distribution pattern of the composite water channel series are determined, and the structural characterization of the composite water channel series plane sand body building is completed.
S4: and (3) based on the analysis result of the composite water channel series, under the guidance of the composite water channel section and plane superposition mode, synthesizing the interface calibration result of the composite water channel structure, and carrying out the composite water channel level sand body building structure analysis based on the composite water channel series constraint according to the composite water channel series section superposition type.
Further, the step S4 specifically includes the following sub-steps:
s41: determining well seismic identification characteristics of different situations based on the dissection results of the composite water channel series under two conditions of an isolated vertical type and a cutting type, further respectively carrying out dissection of the sand body building structure of the section of the composite water channel by taking the section splicing or adding mode of the composite water channel as guidance, and determining the thicknesses and mutual overlapping relations of different types of composite water channels;
the well seismic identification characteristics under the isolated condition are characterized in that different composite water channel series are distributed in a layered mode, composite water channels in the same composite water channel series are spliced in a lateral mode, and the well seismic identification characteristics at the boundary of the composite water channels are shown as differences in elevation, thickness, amplitude strength and continuity among sand bodies.
The well seismic identification characteristic under the cut-and-stack type condition is characterized in that different composite water channel series are laterally cut and stacked or laterally stacked, different composite water channels in the same composite water channel series are layered and show that erosion and additive effects coexist, composite water channels in the series are additively stacked with erosion characteristics, the well seismic identification characteristic at the boundary of the composite water channels shows that sand bodies are mutually cut and stacked, and the seismic amplitude intensity and the seismic continuity have more obvious difference than those under the isolated condition.
S42: and (4) taking the result of the step (S41) as a constraint, extracting seismic attributes capable of reflecting the composite water channel, further determining the plane boundary of the composite water channel under the guidance of the plane stacking mode of the composite water channel, determining the flow path, the width and the plane distribution pattern of the composite water channel, and finishing the representation of the plane sand body building structure of the composite water channel.
S5: and (3) based on the analysis result of the composite water channel, synthesizing the calibration result of the structure interface of the single water channel under the guidance of the section and the plane distribution mode of the single water channel, and carrying out the sand body building structure analysis of the single water channel.
Further, the step S5 specifically includes the following sub-steps:
s51: on the basis of the composite water channel dissection result, under the guidance of three types of profile migration modes of single water channel connectivity, semi-connectivity and non-connectivity, the single water channel well seismic calibration result is synthesized, single water channel profile sand body building structure dissection is carried out, and the thickness of a single water channel, the mutual overlapping relation and the connectivity of the single water channel are determined;
s52: and (4) determining the plane boundary of the single water channel under the guidance of the plane migration mode of the single water channel on the basis of the result of the step (S51), and determining the flow path, the width and the plane distribution pattern of the single water channel to finish the characterization of the plane sand body building structure of the single water channel.
Compared with the prior art, the invention has the following advantages:
according to the method, the scientific and reasonable prediction of the different-level cause sand body forms, the flow paths, the scales and the mutual overlapping relation of the different-level cause sand body forms, the flow paths and the scales of the deep sea water channel is realized in a refined, systematized and quantitative mode according to the structure constraint, the sand body structure cause mode constraint and the three-dimensional space horizontal section interaction constraint from large to small, and the effective representation of the reservoir heterogeneity of the deep sea water channel oil and gas reservoir is realized, so that important geological basis and guidance are provided for the injection and production corresponding relation analysis, the bottom water inrush path analysis, the residual oil distribution prediction and the like of the oil and gas reservoir, and therefore, the method has great practical engineering significance for the efficient development of the deep sea water channel oil and.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for dissecting a sand body building structure of different-level formation reasons of a deep sea water channel in a thin well network area;
FIG. 2 is a diagram of deep sea water channel configuration interface recognition based on core-logging-seismic calibration;
FIG. 3 is a flow chart of a water channel system level sand building structure dissection technique;
FIG. 4 is a result of an example area water course system level sand body building structure dissection;
FIG. 5 is a flow chart of a construction structure dissection technique for a composite water channel series level sand body;
FIG. 6 shows the result of the structure anatomy of the composite water channel series level sand structure in the example area;
FIG. 7 is a flow chart of a composite water channel level sand building structure dissection technique;
FIG. 8 is a schematic diagram of an example zone well and seismic identification signature result;
FIG. 9 shows the anatomical results of the composite channel level sand building structure in the example area;
FIG. 10 is a flow chart of a single channel level sand building structure dissection technique;
figure 11 is the result of an example zone single channel level sand building structure dissection.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is further described with reference to the accompanying drawings and embodiments. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict. In addition, unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this invention belongs.
As shown in figure 1, the invention provides a method for dissecting a deep sea water channel sand body building structure in a thin well network area, which comprises the following steps:
s1: based on core-logging-seismic data calibration analysis, carrying out identification on different-level cause sand body building structure interfaces of the deep sea water channel; the deep sea water channel is divided into four levels from large to small, namely a water Channel System (CS), a composite water channel series (CCS), a composite water channel (CC) and a single water channel (C).
Firstly, identifying a structural interface of a single water channel level on a rock core according to the small scouring or lithofacies mutation characteristics of the single water channel bottom interface; then, calibrating logging by using a rock core, further determining the interface characteristics of the single water channel level structure on a logging curve, and identifying the logging response characteristics of the composite water channel level structure interface through the single water channel combination, the medium-sized scouring surface and the rock phase change characteristics; and finally, calibrating the earthquake by using a logging, determining the earthquake response characteristics of the interfaces of the single water channel and the composite water channel structure through the analysis of the well earthquake section morphology and pattern, and identifying the earthquake response characteristics of the interfaces of the composite water channel series and the water channel system level structure through the combination of the composite water channel and the analysis of the earthquake section structure. As shown in fig. 2, the structural interfaces of the sand bodies of the four deep-sea water channel levels, i.e. the water channel system, the composite water channel series, the composite water channel and the single water channel, can be identified by means of core calibration logging and logging seismic calibration.
S2: taking the three-level sequence interface as constraint, fitting well drilling and seismic data according to the interface calibration result of the water channel system structure under the guidance of the water channel system deposition mode, and carrying out the sand body building structure analysis of the water channel system level;
as shown in fig. 3, the dissection technical process of the sand body building structure of the water Channel System (CS) level specifically includes: firstly, determining a three-level sequence stratum interface according to a seismic reflection structure and a homophase axis termination relation; taking the water channel system as a constraint, under the guidance of a limiting, semi-limiting and non-limiting water channel system section sedimentation mode, carrying out identification and tracking explanation on a four-level sequence interface by synthesizing well seismic calibration results of a water channel system structure interface, carrying out water channel system section sand body building structure characterization in the framework, and determining the section form, the thickness and the section distribution pattern of the water channel system section sand body building structure; and (3) taking profile anatomy as constraint, extracting seismic attributes of the four-level sequence interface constraint under the guidance of a water channel system plane evolution mode, determining a water channel system plane boundary, determining a flow path, a width and a plane distribution pattern of the water channel system plane boundary, and finishing the water channel system plane sand body building structure representation.
As shown in fig. 4, in which (a) is a cross-sectional dissection result of a water channel system, (b) is a plane dissection result of the water channel system I + II, and (c) is a plane dissection result of the water channel system III, the dissection results of the water channel system in the example area indicate that a four-level sequence interface is seen inside, three-level water channel systems develop together from top to bottom, and flow paths all show from east to west, wherein the first level is a restrictive water channel system, a large lower cutting valley develops at the bottom, no obvious natural dikes are arranged at two sides, the thickness is 91 m-200 m, and the water channel system is obviously eroded by later-level water channels, resulting in incomplete width; the stage II is a semi-restricted water channel system, the bottom of the semi-restricted water channel system is obviously developed into a large lower cut valley, wedge-shaped natural dikes are developed on two sides, the thickness of the wedge-shaped natural dike ranges from 45m to 300m, and the width of the wedge-shaped natural dike ranges from 1200m to 3000 m; stage III is a non-limiting water channel system, no obvious large-scale downward cutting valley is seen at the bottom of the non-limiting water channel system, the thickness is 120-280 m, and the width is 1000-3500 m; the sand bodies in each period are in a strip shape, and the width of the sand bodies tends to increase from east to west.
S3: based on the analysis result of the water channel system, under the guidance of the vertical superposition mode of the composite water channel series, the interface calibration result of the composite water channel series structure is synthesized, the fine identification and tracking of the earthquake small layer are carried out, and the sand body building structure analysis of the composite water channel series grade is realized;
as shown in fig. 5, the process of the composite water channel series (CCS) level sand body building structure anatomy technology specifically comprises: based on the dissection result of a water Channel System (CS), an isolated vertical type, stacked type and cut-and-stack type vertical stacking mode of the composite water channel is taken as guidance, on the basis of the well seismic calibration result of the composite water channel series, seismic small layer recognition of three-level and four-level sequence interface constraints is carried out, the whole area fine tracking interpretation is completed, the structural characterization of the section sand body of the composite water channel series is carried out in the framework, and the thickness and the section stacking pattern are determined; based on the dissection of the composite water channel series section, the seismic attribute with obvious response to the composite water channel series is screened out by utilizing the seismic attribute optimization technology based on well-seismic combination, the plane boundary of the composite water channel series is determined, the flow path, the width and the plane distribution pattern of the composite water channel series are determined, and the structural characterization of the composite water channel series plane sand body building is completed.
The seismic attribute optimization technology based on well-seismic combination specifically comprises the following steps: the interpretation of the well logging curve on the sand body of the composite water channel series is realized through rock-electricity calibration, various seismic attributes of the well side channel are further extracted, on the basis, intersection drawing between different seismic attributes and well logging recognition sand body thickness and different layer sand-to-ground ratios is drawn, various seismic attributes capable of distinguishing the composite water channel series and deep-sea mudstone are preferably selected through correlation, on the basis of normalization, fusion of the various seismic attributes is realized through a mathematical statistics method, and the optimal fusion seismic attribute reflecting the composite water channel series is extracted.
As shown in FIG. 6, the dissection results of the composite water channel series are shown in (a) section, (b) the planar dissection results of the composite water channel series ① - ③, (c) the planar dissection results of the composite water channel series ④ - ⑥, and the dissection results of the composite water channel series in the example area show that the composite water channel series in the water channel system can be divided into six stages, the composite water channel series at the lower part of the water channel system is mainly isolated, and the composite water channel series at the middle and upper parts are mainly stacked, which is probably caused by different stage sediment supply types and structure motion differences, the composite water channel series ① is 80-120 m in thickness and 3000m in width, the composite water channel series ② is 60-70 m in thickness and 2000-2500 m in width, the composite water channel series ③ is 20-30m in thickness and 1500m in width, the composite water channel series ④ is about 100m in thickness and about 1500m in average width, but the width of the water channel series near a well zone can be obviously increased to 2500m, the maximum 2500m, the composite water channel series ⑤ is 100 m-150 m in thickness and 1200-1600 m in width, the composite water channel series ⑥ m in thickness and the composite water channel series I and the flow direction can be gradually decreased according to the scale of the up-to-down.
S4: based on the analysis results of the composite water channel series, under the guidance of the section and plane superposition patterns of the composite water channel, synthesizing the interface calibration results of the composite water channel structure, dividing the section superposition types of the composite water channel series, and respectively carrying out the analysis of the composite water channel level sand body building structure based on the composite water channel series (CCS) constraint;
as shown in fig. 7, the process of the anatomical technology of the composite water channel (CC) level sand building structure specifically includes: determining well seismic identification characteristics (as shown in figure 8) of different situations based on a composite water channel series (CCS) dissection result in an isolated vertical type situation and a cutting type situation, and then respectively carrying out sand body building structure dissection on composite water channel sections by taking a composite water channel section splicing or adding mode as guidance to determine the thicknesses of different types of composite water channels and the mutual overlapping relation of the composite water channels; and taking the obtained result as constraint, extracting seismic attributes capable of reflecting the composite water channel, determining the plane boundary of the composite water channel under the guidance of the plane superposition mode of the composite water channel, determining the flow path, the width and the plane distribution pattern of the composite water channel, and finishing the structural characterization of the plane sand body building of the composite water channel.
Wherein, to the well shake identification characteristic of isolated vertical situation, its characteristic is that it is the lamellar distribution to be between different compound water course series, and same series thickness is similar with single water course, belongs to water course lateral migration cause, and this makes and is the side direction concatenation formula between the inside compound water course of series, and compound water course border department well shakes identification characteristic and shows: the height, thickness, amplitude strength and continuity of sand bodies have certain difference.
Wherein, to the well shake discernment characteristic of the formula of cutting and folding situation, its characteristic is that the side direction is cut between different compound water course series and is folded or the side is long-pending, is the stratiform between the inside different compound water course of same series, shows to corrode and add long-pending effect coexistence, this makes to be the adding long-pending formula superpose of certain erosion characteristic between the inside compound water course of series, and compound water course border department well shake discernment characteristic shows to be: the sand bodies are mutually cut and overlapped, and the seismic amplitude intensity and the continuity have obvious difference. The composite water channel can further develop seismic splitting and carving of the stacked body.
As shown in fig. 9, (a) is a compound water channel section dissection result, (b) is a compound water channel plane dissection result for an isolated series, (c) is a compound water channel plane dissection result for a stacked series, and the example area compound water channel sand body building structure dissection result shows that a compound water channel series ② is in isolated contact with an upper series and a lower series, and the two stages of internal development of the compound water channel series are laterally spliced, the width of the compound water channel is about 2.5km, the thickness of the compound water channel is 39M-60M, and internal natural dikes are developed on two sides of the compound water channel series, the compound water channel series ⑤ is in stacked contact, and the series can be subdivided into two layers of M5-1 and M5-2 by seismic splitting and carving of the stacked body, wherein the compound water channel laterally stacked at the internal development stage 3 of the M5-1 layer has the width of 1.2 km, the thickness of 55-96M, the compound water channel series has the thickness of 5-2 layer, the compound water channel at the development stage 1 has the width of 1-1.5km and the depth of 38-86M, and the compound water channels flow.
S5: and (3) based on the analysis result of the composite water channel, synthesizing the calibration result of the structure interface of the single water channel under the guidance of the section and plane distribution pattern of the single water channel, and carrying out the sand body building structure analysis of the single water channel.
As shown in fig. 10, the single water channel (C) level sand body building structure dissection technical process specifically includes: on the basis of the composite water channel dissection result, under the guidance of three types of profile migration modes of single water channel connectivity, semi-connectivity and non-connectivity, the single water channel well seismic calibration result is synthesized, single water channel profile sand body building structure dissection is carried out, and the thickness of a single water channel, the mutual overlapping relation and the connectivity of the single water channel are determined; based on the method, under the guidance of a single water channel plane migration mode, the plane boundary of the single water channel is determined, the flow path, the width and the plane distribution pattern of the single water channel are determined, and the single water channel plane sand body building structure representation is completed.
As shown in FIG. 11, the anatomical results of M5-2 single water channels in the example area show that 4 single water channels which migrate in sequence from the north to the south develop in the example area, the width of the single water channels ranges from 120M to 250M, the thickness of the single water channels ranges from 20M to 30M, and the single water channels can be known to have non-permeable mudstone layers by well seismic calibration.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An anatomy method of a deep sea water channel sand body building structure in a thin well network area is characterized by comprising the following steps:
s1: based on core-logging-seismic data calibration analysis, carrying out identification on different-level cause sand body building structure interfaces of the deep sea water channel;
s2: taking the three-level sequence interface as constraint, fitting well drilling and seismic data according to the interface calibration result of the water channel system structure under the guidance of the water channel system deposition mode, and carrying out the sand body building structure analysis of the water channel system level;
s3: based on the analysis result of the water channel system, under the guidance of the vertical superposition mode of the composite water channel series, the interface calibration result of the composite water channel series structure is synthesized, the identification and tracking of the earthquake small layer are carried out, and the sand body building structure analysis of the composite water channel series grade is realized;
s4: on the basis of the analysis result of the composite water channel series, under the guidance of the composite water channel section and plane superposition mode, the interface calibration result of the composite water channel structure is synthesized, and the analysis of the composite water channel level sand body building structure based on the composite water channel series constraint is carried out according to the superposition type of the composite water channel series section;
s5: and (3) based on the analysis result of the composite water channel, synthesizing the calibration result of the structure interface of the single water channel under the guidance of the section and the plane distribution mode of the single water channel, and carrying out the sand body building structure analysis of the single water channel.
2. The method for dissecting deep sea waterway sand body building structure of the thin well network area of claim 1, wherein the deep sea waterway comprises the following four different levels from large to small: water channel system, composite water channel series, composite water channel and single water channel.
3. The method for dissecting a deep sea waterway sand body building structure in a thin well network area, according to claim 2, wherein the step S1 specifically comprises the following sub-steps:
s11: identifying a structural interface of a single water channel level on a rock core according to the small scouring or lithofacies mutation characteristics of the single water channel bottom interface;
s12: calibrating a well by using a rock core, determining the interface characteristics of the single water channel level structure on a well logging curve, and identifying the well logging response characteristics of the composite water channel level structure interface through the single water channel combination, the medium-sized scouring surface and the rock phase change characteristics;
s13: and calibrating the earthquake by using a logging, determining the earthquake response characteristics of the interfaces of the single water channel and the composite water channel structure through the analysis of the well earthquake section morphology and pattern, and identifying the earthquake response characteristics of the interfaces of the composite water channel series and the water channel system level structure through the analysis of the composite water channel combination and the earthquake section structure.
4. The method for dissecting a deep sea waterway sand body building structure in a thin well network area, according to claim 3, wherein the step S2 specifically comprises the following sub-steps:
s21: determining a three-level sequence stratum interface according to the seismic reflection structure and the homophase axis termination relation;
s22: taking the three-level sequence stratum interface as constraint, and under the guidance of limiting, semi-limiting and non-limiting water channel system section sedimentation modes, carrying out identification and tracking interpretation of the four-level sequence interface by synthesizing well seismic calibration results of the water channel system structure interface, carrying out water channel system section sand body building structure characterization in the framework, and determining the section form, thickness and section distribution pattern of the water channel system section sand body building structure;
s23: and (3) taking profile anatomy as constraint, extracting seismic attributes of the four-level sequence interface constraint under the guidance of a water channel system plane evolution mode, determining a water channel system plane boundary, determining a flow path, a width and a plane distribution pattern of the water channel system plane boundary, and finishing the water channel system plane sand body building structure representation.
5. The method for dissecting a deep sea waterway sand body building structure in a thin well network area, according to claim 4, wherein the step S3 specifically comprises the following sub-steps:
s31: based on the water channel system dissection result, the isolated vertical type, stacked type and cut-and-stack type vertical stacking mode of the composite water channel is taken as guidance, on the basis of the composite water channel series well seismic calibration result, seismic small layer identification of three-level and four-level sequence interface constraints is carried out, the whole-area tracking interpretation is completed, the structural characterization of the composite water channel series section sand body building is carried out in the framework, and the thickness and the section stacking pattern are determined;
s32: based on the dissection of the composite water channel series section, the seismic attribute with obvious response to the composite water channel series is screened out by utilizing the seismic attribute optimization technology based on well-seismic combination, the plane boundary of the composite water channel series is determined, the flow path, the width and the plane distribution pattern of the composite water channel series are determined, and the structural characterization of the composite water channel series plane sand body building is completed.
6. The method for dissecting a deep sea waterway sand body building structure in a thin well network area, according to claim 5, wherein the step S4 specifically comprises the following sub-steps:
s41: determining well seismic identification characteristics of different situations based on the dissection results of the composite water channel series under two conditions of an isolated vertical type and a cutting type, further respectively carrying out dissection of the sand body building structure of the section of the composite water channel by taking the section splicing or adding mode of the composite water channel as guidance, and determining the thicknesses and mutual overlapping relations of different types of composite water channels;
s42: and (4) taking the result of the step (S41) as a constraint, extracting seismic attributes capable of reflecting the composite water channel, further determining the plane boundary of the composite water channel under the guidance of the plane stacking mode of the composite water channel, determining the flow path, the width and the plane distribution pattern of the composite water channel, and finishing the representation of the plane sand body building structure of the composite water channel.
7. The method for dissecting sand body building structures of deep sea water channels in thin well network areas as claimed in claim 6, wherein the well-seismic identification characteristics of the isolated situation are characterized in that different composite water channel series are distributed in a layered manner, the composite water channels in the same composite water channel series are laterally spliced, and the well-seismic identification characteristics at the composite water channel boundaries are represented as differences in elevation, thickness, amplitude strength and continuity among sand bodies.
8. The dissection method for deep sea water channel sand body building structures in the thin well network area according to claim 6 or 7, characterized in that the well seismic identification features in the stacked condition are laterally stacked or laterally stacked between different composite water channel series, different composite water channels in the same composite water channel series are layered and show coexistence of erosion and additive effects, composite water channels in the series are additively stacked with erosion features, the well seismic identification features at the composite water channel boundary show mutual stacking between sand bodies, and the seismic amplitude intensity and continuity have more obvious difference than those in the isolated condition.
9. The method for dissecting a deep sea waterway sand body building structure in a thin well network area, according to claim 6, wherein the step S5 specifically comprises the following sub-steps:
s51: on the basis of the composite water channel dissection result, under the guidance of three types of profile migration modes of single water channel connectivity, semi-connectivity and non-connectivity, the single water channel well seismic calibration result is synthesized, single water channel profile sand body building structure dissection is carried out, and the thickness of a single water channel, the mutual overlapping relation and the connectivity of the single water channel are determined;
s52: and (4) determining the plane boundary of the single water channel under the guidance of the plane migration mode of the single water channel on the basis of the result of the step (S51), and determining the flow path, the width and the plane distribution pattern of the single water channel to finish the characterization of the plane sand body building structure of the single water channel.
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